minor #18244 [Logger] Add missing type monolog config (php config) (qdequippe)

This PR was submitted for the 6.2 branch but it was merged into the 5.4 branch instead.

Discussion
----------

[Logger] Add missing type monolog config (php config)

Commits
-------

0c3c0f5 Add missing type monolog config php config

Author: javiereguiluz

logging/monolog_email.rst

@@ -293,6 +293,7 @@ get logged on the server as well as the emails being sent:
             ;
 
             $monolog->handler('group')
+                ->type('group')
                 ->members(['streamed', 'deduplicated'])
             ;